Re: [ns] connector related

[Haobo Yu <haoboy@packetdesign.com>]

it's a linked list (the target_ chain in a simplex link); that's the way
you insert an element.

On Mon, 20 Nov 2000, [iso-8859-1] billy dimi wrote:

> copied from ns-link.tcl
> 
> SimpleLink instproc enable-mcast { src dst } {
>     $self instvar iif_ ttl_
>     set iif_ [new NetworkInterface]
>     $iif_ target [$ttl_ target]
>     $ttl_ target $iif_
> 
>     $src add-oif [$self head] $self
>     $dst add-iif [$iif_ label] $self
> }
> 
> I would like to ask the followings:
> 
> First: Why  ttl_ is ralated with iif_ in such a way??
>        As far as i know these two entities have 
> different
>        physical meanings ( ttl_ = time to live for a
> packet
>        which is a number decremented at each node) (
> iif_ = 
>        incoming interface is the interface from which
> the 
>        packet received).
> 
> Second:Shouldn't be
>                 " $ttl_ target [$iif_ target]" 
>        instead of
>                 " $ttl_ target $iif_ "
> 
>        According to "connector.h" we should first set
> or get 
>        the target_ by declaring  "$arg target" and
> then use 
>        the arg[2] target method  " $src target $dst "
> 
> Third: Why do we connect iif_ with ttl_ AND ttl_ with
> iif_ ??
> 
> I think i miss something...Can somebody help ??
> Thanks
> Billy
> 
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